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Revision: 1.6
Committed: Mon Dec 1 19:40:48 2014 UTC (9 years, 5 months ago) by root
Branch: MAIN
Changes since 1.5: +49 -20 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 root 1.1 #!/opt/bin/perl
2    
3 root 1.2 #
4     # Copyright(C) 2014 Marc Alexander Lehmann <vt102@schmorp.de>
5     #
6     # vt102 is free software; you can redistribute it and/or modify it under
7     # the terms of the GNU General Public License as published by the Free
8     # Software Foundation; either version 3, or (at your option) any later
9     # version.
10     #
11     # vt102 is distributed in the hope that it will be useful, but WITHOUT
12     # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13     # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14     # for more details.
15     #
16    
17     # If this file contains embedded ROMs, the above copyright notice does
18     # not apply to them.
19    
20 root 1.1 # this hack is not considered release ready in and way, shape, or form
21     # ./vt102 bash
22     # ./vt102 telnet towel.blinkenlights.nl
23     # ./vt102 curl http://artscene.textfiles.com/vt100/trekvid.vt
24     # ./vt102 curl http://artscene.textfiles.com/vt100/surf.vt # in 3d!
25    
26 root 1.3 # TODO: ctrl
27    
28 root 1.1 use common::sense;
29    
30     $| = 1;
31    
32 root 1.3 my $VT102 = 1;
33 root 1.1 my $AVO = $VT102 || 1;
34     my $KBD = 1;
35    
36     #############################################################################
37 root 1.5 # rom initialising
38 root 1.1
39     my $ROM = do {
40     binmode DATA;
41     local $/;
42     <DATA>
43     };
44    
45     0x6001 == length $ROM or die "corrupted rom image";
46    
47     binmode STDOUT;
48    
49     my @M = (0xff) x 65536; # main memory, = (0xff) x 65536;
50    
51     # populate mem with rom contents
52     if ($VT102) {
53     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x2000, 0x2000;
54     @M[0x8000 .. 0x9fff] = unpack "C*", substr $ROM, 0x4000, 0x2000;
55     } else {
56     @M[0x0000 .. 0x1fff] = unpack "C*", substr $ROM, 0x0000, 0x2000;
57     }
58    
59     #############################################################################
60 root 1.5 # cpu registers and I/O support
61 root 1.1
62 root 1.5 my $PTY; # the pty we allocated, if any
63 root 1.1 my $PRSTATUS = 0;
64    
65     # 8080/8085 registers
66     # b, c, d, e, h, l, a
67     my ($A, $B, $C, $D, $E, $H, $L, $A);
68     my ($PC, $SP, $IFF, $FA, $FZ, $FS, $FP, $FC);
69    
70     my $RST = 0; # 8080 pending interrupts
71     my $INTMASK = 7; # 8085 half interrupts
72     my $INTPEND = 0; # 8085 half interrupts
73    
74     my $x; # dummy temp for instructions
75    
76     my $CLK; # rather inexact clock
77    
78     #############################################################################
79 root 1.5 # the dreaded nvr1400 chip. not needed to get it going, but provided for reference
80 root 1.1
81     # nvram
82     my @NVR = (0x3fff) x 100; # vt102: 214e accum, 214f only lower 8 bit used, first 44 bytes
83     my $NVRADDR;
84     my $NVRDATA;
85     my $NVRLATCH;
86    
87     my @NVRCMD = (
88 root 1.5 sub { $NVRDATA = ($NVRDATA << 1) + $_[1]; }, # 0 accept data
89     sub { $NVRADDR = ($NVRADDR << 1) + $_[1]; }, # 1 accept addr
90     sub { ($NVRDATA <<= 1) & 0x4000 }, # 2 shift out
91     undef, # 3 not used, will barf
92     sub { $NVR[$_[0]] = $NVRDATA & 0x3fff; }, # 4 write
93     sub { $NVR[$_[0]] = 0x3fff; }, # 5 erase
94     sub { $NVRDATA = $NVR[$_[0]]; }, # 6 read
95     sub { }, # 7 standby
96 root 1.1 );
97    
98     my @bitidx;
99     $bitidx[1 << $_] = 9 - $_ for 0..9;
100    
101     # the nvr1400 state machine. what a monster
102     sub nvr() {
103     my $a1 = $bitidx[(~$NVRADDR ) & 0x3ff];
104     my $a0 = $bitidx[(~$NVRADDR >> 10) & 0x3ff];
105    
106     # printf "NVR %02x A %020b %d %d D %02x\n", $NVRLATCH, $NVRADDR & 0xfffff, $a1, $a0, $NVRDATA;
107    
108     $NVRCMD[($NVRLATCH >> 1) & 7]($a1 * 10 + $a0, $NVRLATCH & 1)
109     }
110    
111     #############################################################################
112    
113 root 1.6 my $DC11_REVERSE = 0;
114 root 1.1
115     my $XON = 1; # false if terminal wants us to pause
116     my $PUSARTCMD;
117    
118     my @KXMIT; # current scan queue
119     my %KXMIT; # currently pressed keys
120     my @KQUEUE; # key event queue
121     my $KXCNT; # count for debouncew
122     my @PUSARTRECV;
123     my $KSTATUS;
124    
125     sub out_00 { # pusartdata
126     # handle xon/xoff, but also pass it through
127     if ($_[0] == 0x13) {
128     $XON = 0;
129 root 1.3 return;#d#
130 root 1.1 } elsif ($_[0] == 0x11) {
131     $XON = 1;
132 root 1.3 return;#d#
133 root 1.1 }
134    
135     syswrite $PTY, chr $_[0];
136    
137 root 1.3 $INTPEND |= 1;
138 root 1.1 }
139    
140     sub out_01 {
141     $PUSARTCMD = shift;
142    
143     $INTPEND |= 1 if $PUSARTCMD & 0x01; # VT102, 5.5 txrdy
144 root 1.3 $INTPEND |= 2 if $PUSARTCMD & 0x04 && !@PUSARTRECV; # VT102, 6.5 rxrdy, needed for some reason
145 root 1.1 }
146    
147     sub out_02 { } # baudrate generator
148    
149     sub out_23 { } # unknown
150     sub out_27 { } # unknown
151     sub out_2f { } # unknown, connected to in 0f
152    
153     sub out_42 { } # brightness
154    
155     sub out_62 {
156     $NVRLATCH = shift;
157     }
158    
159 root 1.6 sub out_a2 {
160     my $dc11 = 0x0f & shift;
161    
162     $DC11_REVERSE = 1 if $dc11 == 0b1010;
163     $DC11_REVERSE = 0 if $dc11 == 0b1011;
164     }
165    
166 root 1.1 sub out_c2 { } # unknown
167 root 1.6 sub out_d2 { } # 0..3 == 80c/132c/60hz/50hz
168 root 1.1
169     sub out_82 {
170     # keyboard
171    
172     # CLICK STARTSCAN ONLINE LOCKED | CTS DSR INSERT L1(?)
173     # CLICK STARTSCAN ONLINE LOCKED | LED1 LED2 LED3 LED4
174     $KSTATUS = $_[0];
175    
176     # start new scan unless scan in progress
177     if (($_[0] & 0x40) && !@KXMIT) {
178     # do not reply with keys in locked mode
179     # or during post (0xff),
180     # mostly to skip init and not fail POST,
181     # and to send startup keys only when terminal is ready
182     unless (($_[0] & 0x10) || ($_[0] == 0xff) || ($VT102 && $INTMASK == 0x07)) {
183     if ($KXCNT <= 0 && @KQUEUE) {
184     my $c = shift @KQUEUE;
185    
186     if ($c < 0) { # key up
187     delete $KXMIT{-$c};
188     $KXCNT = 10;
189     } elsif ($c > 0) { # key down
190     undef $KXMIT{$c};
191     $KXCNT = 10;
192     } else { # delay
193     $KXCNT = 100;
194     }
195     }
196    
197     --$KXCNT;
198     @KXMIT = sort keys %KXMIT;
199     }
200    
201     $RST |= 1;
202     }
203     }
204    
205     #############################################################################
206    
207     my $NVRBIT;
208     my $LBA;
209    
210     sub in_00 { # pusart data
211 root 1.3 # interrupt not generated here, because infinite
212     # speed does not go well with the vt102.
213 root 1.1
214     shift @PUSARTRECV
215     }
216    
217     sub in_01 { # pusart status
218     # DSR SYNDET FE OE | PE TXEMPTY RXRDY TXRDY
219     0x85 + (@PUSARTRECV && 0x02)
220     }
221    
222     sub in_22 { # modem buffer(?)
223     # wild guess: -CTS -SPDI -RI -CD 0 0 0 0
224     0x20
225     }
226    
227     sub in_0f { } # unknown, connected to out 2f
228    
229     sub in_42 { # flag buffer
230     ++$LBA;
231    
232     $NVRBIT = nvr ? 0x20 : 0x00 if ($LBA & 0x3) == 0x2;
233    
234     # KBD_XMITEMPTY LBA7 NVRDATA ODDFIELD - OPTION !GFX !AVO PUSART_TXRDY
235    
236     my $f = 0x85 | $NVRBIT;
237    
238     $f |= 0x02 unless $AVO;
239     $f |= 0x40 if $LBA & 0x2;
240    
241     $f
242     }
243    
244     sub in_82 { # tbmt keyboard uart
245     return 0x7f unless @KXMIT;
246    
247     $RST |= 1;
248     shift @KXMIT
249     }
250    
251     sub in_03 { 0xff } # unknown, printer uart input?
252     sub in_0b { 0xff } # unknown
253     sub in_17 { 0xff } # unknown, printer status clear by reading?
254     sub in_1b { 0xff } # unknown
255    
256     #############################################################################
257    
258 root 1.3 sub sf { # set flags (ZSC - AP not implemented)
259 root 1.1 $FS = $_[0] & 0x080;
260     $FZ = ($_[0] & 0x0ff) == 0;
261     $FC = $_[0] & 0x100;
262    
263     $_[0] & 0xff
264     }
265    
266 root 1.3 sub sf_nc { # set flags except carry
267 root 1.1 $FS = $_[0] & 0x080;
268     $FZ = ($_[0] & 0x0ff) == 0;
269    
270     $_[0] & 0xff
271     }
272    
273     my @op = map { sprintf "status(); die 'unknown op %02x'", $_ } 0 .. 255;
274     my @ops;
275    
276     my @reg = qw($B $C $D $E $H $L $M[$H*256+$L] $A);
277     my @cc = ('if !$FZ', 'if $FZ', 'if !$FC', 'if $FC', ';die', ';die', 'if !$FS', 'if $FS'); # die == unimplemented $FP parity
278    
279     # mov r,r / r,M / M,r
280     for my $s (0..7) {
281     for my $d (0..7) {
282     $op[0x40 + $d * 8 + $s] = "$reg[$d] = $reg[$s]";
283     }
284     }
285    
286     $op[0x00] = '';
287    
288     $op[0x01] = '($B, $C) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
289     $op[0x11] = '($D, $E) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
290     $op[0x21] = '($H, $L) = (IMM16 >> 8, IMM16 & 0xff)'; # lxi
291     $op[0x31] = '$SP = IMM16' ; # lxi #d# 0xf000 because of limited stack
292    
293     $op[0x02] = '$M[$B * 256 + $C] = $A'; # stax
294     $op[0x12] = '$M[$D * 256 + $E] = $A'; # stax
295     $op[0x32] = '$M[IMM16 ] = $A'; # sta
296    
297     sub inxdcx($$$) {
298     $x = ($_[0] * 256 + $_[1] + $_[2]) & 0xffff;
299     $_[0] = $x >> 8;
300     $_[1] = $x & 0xff;
301     }
302    
303     $op[0x03] = 'inxdcx $B, $C, 1'; # inx
304     $op[0x13] = 'inxdcx $D, $E, 1'; # inx
305     $op[0x23] = 'inxdcx $H, $L, 1'; # inx
306     $op[0x33] = '$SP++' ; # inx
307     $op[0x0b] = 'inxdcx $B, $C, -1'; # dcx
308     $op[0x1b] = 'inxdcx $D, $E, -1'; # dcx
309     $op[0x2b] = 'inxdcx $H, $L, -1'; # dcx
310     $op[0x3b] = '--$SP' ; # dcx
311    
312     # "no carry" doesn't seem to be needed for vt100 - optimize?
313     $op[0x04 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] + 1" for 0..7; # inr
314     $op[0x05 + $_ * 8] = "$reg[$_] = sf_nc $reg[$_] - 1" for 0..7; # dcr
315    
316     # mvi r / M
317     $op[0x06 + $_ * 8] = "$reg[$_] = IMM8" for 0..7;
318    
319     # getting this insn wrong (its the only 16 bit insn to modify flags)
320     # wasted three of my best days with mindless vt102 rom reverse engineering
321     sub dad {
322     $x = $H * 256 + $L + $_[0];
323    
324     ($H, $L) = (($x >> 8) & 0xff, $x & 0xff);
325     $FC = $x > 0xffff;
326     }
327    
328     $op[0x09] = 'dad $B * 256 + $C'; # dad
329     $op[0x19] = 'dad $D * 256 + $E'; # dad
330     $op[0x29] = 'dad $H * 256 + $L'; # dad
331     $op[0x39] = 'dad $SP '; # dad
332    
333     $op[0x07] = ' $FC = $A >> 7; $A = ($A * 2 + $FC) & 0xff '; # rlc
334     $op[0x17] = ' ($FC, $A) = ($A >> 7, ($A * 2 + $FC) & 0xff)'; # ral
335    
336     $op[0x0f] = ' $FC = $A & 1; $A = ($A >> 1) | ($FC && 0x80) '; # rrc
337     $op[0x1f] = ' ($FC, $A) = ($A & 1, ($A >> 1) | ($FC && 0x80))'; # rar
338    
339     $op[0x0a] = '$A = $M[$B * 256 + $C]'; # ldax b
340     $op[0x1a] = '$A = $M[$D * 256 + $E]'; # ldax d
341     $op[0x3a] = '$A = $M[IMM16]'; # lda
342    
343     $op[0x20] = '$A = $INTPEND * 16 + $INTMASK + ($IFF && 8)'; # rim (incomplete)
344     $op[0x30] = '$INTMASK = $A & 7 if $A & 8'; # sim (incomplete)
345    
346     $op[0x22] = '($M[IMM16], $M[IMM16 + 1]) = ($L, $H)'; # shld
347     $op[0x2a] = '($L, $H) = ($M[IMM16], $M[IMM16 + 1])'; # lhld
348    
349     # yeah, the fucking setup screens actually use daa...
350     $op[0x27] = '
351     my ($h, $l);
352    
353     ($h, $l) = ($A >> 4, $A & 15);
354    
355     if ($l > 9 || $FA) {
356     $A = sf $A + 6;
357     ($h, $l) = ($A >> 4, $A & 15);
358     }
359    
360     if ($h > 9 || $FC) {
361     $h += 6;
362     $A = ($h * 16 + $l) & 0xff;
363     }
364     '; # daa, almost certainly borked, also, acarry not set by sf
365    
366     $op[0x2f] = '$A ^= 0xff'; # cma
367    
368     $op[0x37] = '$FC = 1 '; # stc
369     $op[0x3f] = '$FC = !$FC'; # cmc
370    
371     $op[0x76] = 'die "HLT"'; # hlt
372    
373     $op[0x80 + $_] = '$A = sf $A + ' . $reg[$_] for 0..7; # add
374     $op[0x88 + $_] = '$A = sf $A + $FC + ' . $reg[$_] for 0..7; # adc
375     $op[0x90 + $_] = '$A = sf $A - ' . $reg[$_] for 0..7; # sub
376     $op[0x98 + $_] = '$A = sf $A - $FC - ' . $reg[$_] for 0..7; # sbb
377     $op[0xa0 + $_] = '$A = sf $A & ' . $reg[$_] for 0..7; # ana
378     $op[0xa8 + $_] = '$A = sf $A ^ ' . $reg[$_] for 0..7; # xra
379     $op[0xb0 + $_] = '$A = sf $A | ' . $reg[$_] for 0..7; # ora
380     $op[0xb8 + $_] = ' sf $A - ' . $reg[$_] for 0..7; # cmp
381     # possible todo: optimize ora a, maybe xra a
382    
383     $op[0xc6 + $_] = '$A = sf $A + IMM8'; # adi
384     $op[0xd6 + $_] = '$A = sf $A - IMM8'; # sui
385     $op[0xe6 + $_] = '$A = sf $A & IMM8'; # ani
386     $op[0xee + $_] = '$A = sf $A ^ IMM8'; # xri
387     $op[0xf6 + $_] = '$A = sf $A | IMM8'; # ori
388     $op[0xfe + $_] = ' sf $A - IMM8'; # cpi
389    
390     $op[0xc1] = '($C, $B) = (POP, POP)'; # pop
391     $op[0xd1] = '($E, $D) = (POP, POP)'; # pop
392     $op[0xe1] = '($L, $H) = (POP, POP)'; # pop
393     $op[0xf1] = '($x, $A) = (POP, POP); ($FS, $FZ, $FA, $FP, $FC) = (!!($x & 0x80), !!($x & 0x40), !!($x & 0x10), !!($x & 0x04), !!($x & 0x01))'; # pop psw
394    
395     $op[0xeb] = '($D, $E, $H, $L) = ($H, $L, $D, $E)'; # xchg
396    
397     $op[0xc2 + $_ * 8] = 'BRA IMM16 ' . $cc[$_] for 0..7; # jcc
398     $op[0xc3] = 'JMP IMM16'; # jmp
399    
400     $op[0xc4 + $_ * 8] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16) ' . $cc[$_] for 0..7; # ccc
401     $op[0xcd] = '(PUSH PC >> 8), (PUSH PC & 0xff), (BRA IMM16)'; # call
402    
403     $op[0xc7 + $_ * 8] = "JMP $_ * 8" for 0..7; # rst
404    
405     $op[0xc0 + $_ * 8] = 'BRA POP + POP * 256 ' . $cc[$_] for 0..7; # rcc
406     $op[0xc9] = 'JMP POP + POP * 256'; # ret
407    
408     $op[0xc5] = 'PUSH $B; PUSH $C';
409     $op[0xd5] = 'PUSH $D; PUSH $E';
410     $op[0xe5] = 'PUSH $H; PUSH $L';
411     $op[0xf5] = 'PUSH $A; PUSH +($FS && 0x80) | ($FZ && 0x40) | ($FA && 0x10) | ($FP && 0x04) | ($FC && 0x01)'; # psw
412    
413     $op[0xd3] = 'OUT'; # out
414     $op[0xdb] = 'IN'; # in
415    
416     # e3 xthl @ 917b, hl <-> (sp)
417    
418     $op[0xe9] = 'JMP $H * 256 + $L'; # pchl
419    
420     $op[0xf3] = '$IFF = 0'; # DI
421     $op[0xfb] = '$IFF = 1'; # EI
422    
423     @ops = @op; # for debugging #d#
424    
425     #############################################################################
426    
427     # print cpu status, for debugging
428     sub status {
429     my $PC = shift || $PC;
430    
431     printf "%04x/%04x A=%02x BC=%02x:%02x DE=%02x:%02x HL=%02x:%02x ZSCAP=%s: %02x %s\n",
432     $PC, $SP,
433     $A, $B, $C, $D, $E, $H, $L,
434     ($FZ ? "1" : "0")
435     . ($FS ? "1" : "0")
436     . ($FC ? "1" : "0")
437     . ($FA ? "1" : "0")
438     . ($FP ? "1" : "0"),
439     $M[$PC], $ops[$M[$PC]];
440     }
441    
442     #############################################################################
443    
444     my @chr = (
445 root 1.5 " " , "\x{29eb}", "\x{2592}", "\x{2409}",
446     "\x{240c}", "\x{240d}", "\x{240a}", "\x{00b0}",
447     "\x{00b1}", "\x{2424}", "\x{240b}", "\x{2518}",
448     "\x{2510}", "\x{250c}", "\x{2514}", "\x{253c}",
449     "\x{23ba}", "\x{23bb}", "\x{2500}", "\x{23bc}",
450     "\x{23bd}", "\x{251c}", "\x{2524}", "\x{2534}",
451     "\x{252c}", "\x{2502}", "\x{2264}", "\x{2265}",
452     "\x{03c0}", "\x{2260}", "\x{00a3}", "\x{00b7}",
453 root 1.1 (map chr, 0x020 .. 0x7e),
454     );
455    
456     utf8::encode $_ for @chr;
457    
458 root 1.6 my @sgr; # sgr sequences for attributes
459    
460     for (0x00 .. 0xff) {
461     my $sgr = "";
462    
463     $sgr .= ";5" unless $_ & 0x01;
464     $sgr .= ";4" unless $_ & 0x02;
465     $sgr .= ";1" unless $_ & 0x04;
466     $sgr .= ";7" if $_ & 0x80;
467    
468     $sgr[$_] = "\e[${sgr}m";
469     }
470    
471 root 1.1 sub prscr {
472     my $i = 0x2000;
473    
474 root 1.6 my $scr = sprintf "\e[H--- KBD %08b CLK %d\e[K\n", $KSTATUS, $CLK;
475    
476     $scr .= "\e[?5" . ($DC11_REVERSE ? "h" : "l");
477 root 1.5
478 root 1.1 line:
479 root 1.6 for my $y (0 .. 25) { # ntsc, two vblank delay lines, up to 24 text lines
480     my $prev_sgr;
481    
482 root 1.1 $scr .= sprintf "%2d |", ++$y;
483    
484 root 1.6 for (0..139) {
485     my $c = $M[$i];
486 root 1.1
487     if ($c == 0x7f) { # also 0xff, but the firmware avoids that
488 root 1.6 $scr .= "\e[m|\e[K\n";
489 root 1.1
490 root 1.6 my $a1 = $M[$i + 1];
491     my $a0 = $M[$i + 2];
492 root 1.1
493     $i = 0x2000 + (($a1 * 256 + $a0) & 0xfff);
494    
495     next line;
496     }
497    
498 root 1.6 my $sgr = $sgr[ ($M[$i++ + 0x1000] & 15) | ($c & 0x80)];
499    
500     # ~1 sgr 5 blink
501     # ~2 sgr 4 underline
502     # ~4 sgr 1 bold
503     # 0x80 in attr, sgr 7, reversed
504    
505     $scr .= $prev_sgr = $sgr if $sgr ne $prev_sgr;
506    
507     $scr .= $chr[$c & 0x7f];
508 root 1.1 }
509    
510 root 1.6 $scr .= "\e[K\nvideo overflow\e[K\n";
511 root 1.1 last;
512     }
513    
514 root 1.6 $scr .= "\e[m";
515    
516 root 1.1 if (0) {
517 root 1.6 $scr .= "\e[K\n";
518 root 1.1 for my $o (0x200 .. 0x232) {
519     $scr .= sprintf "%04x:", $o * 16;
520     for (0..15) {
521     $scr .= sprintf " %02x", $M[$o * 16 + $_];
522     }
523 root 1.6 $scr .= "\e[K\n";
524 root 1.1 }
525     }
526    
527 root 1.6 $scr .= "\e[J";
528 root 1.1
529     syswrite STDOUT, $scr;
530     }
531    
532     #############################################################################
533    
534     if (@ARGV) {
535     require IO::Pty;
536     $PTY = IO::Pty->new;
537    
538     my $slave = $PTY->slave;
539    
540 root 1.3 $PTY->set_winsize (24, 80);
541    
542 root 1.1 unless (fork) {
543     $ENV{TERM} = $VT102 ? "vt102" : "vt100";
544    
545     close $PTY;
546    
547     open STDIN , "<&", $slave;
548     open STDOUT, ">&", $slave;
549     open STDERR, ">&", $slave;
550    
551 root 1.3 system "stty ixoff erase ^H";
552    
553     $PTY->make_slave_controlling_terminal;
554     $PTY->close_slave;
555 root 1.1
556     exec @ARGV;
557     }
558    
559 root 1.3 $PTY->close_slave;
560    
561 root 1.1 } else {
562     open $PTY, "</dev/null" or die;#d
563     }
564    
565     #############################################################################
566    
567     # initial key input, to set up online mode etc.
568     @KQUEUE = (
569     0x7b, -0x7b, # setup
570     0, # delay
571     0x28, -0x28, # 4, toggle local/online
572     0x38, -0x38, # 5, setup b
573     0, # delay
574     (0x10, -0x10) x 2, # cursor right
575     0x37, -0x37, # 6 toggle soft scroll
576     (0x10, -0x10) x 1, # cursor right
577     0x37, -0x37, # 6 toggle autorepeat off
578     (0x10, -0x10) x 8, # cursor right
579     0x37, -0x37, # 6 toggle keyclick
580     (0x10, -0x10) x 1, # cursor right
581     $VT102 ? () : (0x37, -0x37), # 6 toggle ansi/vt52
582     (0x10, -0x10) x 7, # cursor right
583     0x37, -0x37, # 6 toggle wrap around
584     0x7b, -0x7b, # leave setup
585     );
586    
587     #############################################################################
588    
589     # 0x80 shift, 0x100 ctrl, 0x200 toggle
590     my %KEYMAP = (
591     "\t" => 0x3a,
592     "\r" => 0x64,
593     "\n" => 0x44,
594    
595     # hardcoded rxvt keys
596     "\e" => 0x2a, # ESC
597     "\e[3~" => 0x03, # DC
598     "\e[5~" => 0x7e, # CAPS LOCK (prior)
599     "\e[6~" => 0x6a, # NO SCROLL (next)
600     "\e[A" => 0x30, # UP
601     "\e[B" => 0x22, # DOWN
602     "\e[C" => 0x10, # RIGHT
603     "\e[D" => 0x20, # LEFT
604     "\e[a" => 0x30 | 0x080, # UP
605     "\e[b" => 0x22 | 0x080, # DOWN
606     "\e[c" => 0x10 | 0x080, # RIGHT
607     "\e[d" => 0x20 | 0x080, # LEFT
608     "\e[7~" => 0x7b, # SETUP (home)
609     "\e[8~" => 0x23, # BREAK (end)
610     "\e[8\$" => 0x23 | 0x080, # SHIFT BREAK / DISCONNECT (shift-end)
611     "\x7f" => 0x33, # BACKSPACE
612    
613     "\e[11~" => 0x32, # F1
614     "\e[11~" => 0x42, # F2
615     "\e[11~" => 0x31, # F3
616     "\e[11~" => 0x41, # F4
617     );
618    
619     @KEYMAP{map chr, 0x20..0x40} = unpack "C*", pack "H*",
620     "779ad5a9a8b8a755a6b5b6b466256575" . "351a3929283837273626d656e634e5f5" . "b9";
621    
622     @KEYMAP{map chr, 0x5b .. 0x7e} = unpack "C*", pack "H*",
623     "154514b7a5" . "244a6879591949485816574746766706" . "050a185a0817780969077a95c594a4";
624    
625     $KEYMAP{"\x3f" & $_} ||= $KEYMAP{$_} | 0x100 for "a" .. "z"; # ctrl
626     $KEYMAP{uc $_} ||= $KEYMAP{$_} | 0x080 for "a" .. "z"; # shift
627    
628     my $KEYMATCH = join "|", map quotemeta, reverse sort keys %KEYMAP;
629     $KEYMATCH = qr{^($KEYMATCH)}s;
630    
631     sub key {
632     my ($key) = @_;
633    
634     state %MOD;
635    
636     push @KQUEUE, -0x7c if !($key & 0x100) && delete $MOD{0x7c}; # ctrl-up
637     push @KQUEUE, -0x7d if !($key & 0x080) && delete $MOD{0x7d}; # shift-up
638    
639     push @KQUEUE, 0x7c if $key & 0x100 && !$MOD{0x7c}++; # ctrl-down
640     push @KQUEUE, 0x7d if $key & 0x080 && !$MOD{0x7d}++; # shift-down
641    
642     $key &= 0x7f;
643     push @KQUEUE, $key, -$key;
644     }
645    
646     my $STDIN_BUF;
647    
648     sub stdin_parse {
649     key $KEYMAP{$1}
650     while $STDIN_BUF =~ s/$KEYMATCH//;
651    
652     # skip input we can't decipher
653     substr $STDIN_BUF, 0, 1, "";
654     }
655    
656     if ($KBD) {
657     system "stty -icanon -icrnl -inlcr -echo min 1 time 0";
658     eval q{ sub END { system "stty sane" } };
659     $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { exit 1 };
660     }
661    
662     #############################################################################
663    
664     my @ICACHE; # compiled instruction cache
665    
666     # the cpu
667     while () {
668    
669     # execute extended basic blocks
670     $PC = ($ICACHE[$PC] ||= do {
671     my $pc = $PC;
672    
673     my $insn = "";
674    
675     # the jit compiler
676     for (0..15) {
677    
678     # optional tracing support
679     if (0) {
680     $insn .= qq<
681     if (\$PRSTATUS) {
682     status $pc;
683     die unless --\$PRSTATUS;
684     }
685     >;
686     }
687    
688     my $imm;
689     my $op = $op[$M[$pc++]];
690    
691     for ($op) {
692     s/\bPUSH\b/\$M[--\$SP] =/g; # push byte to stack
693     s/\bPOP\b/\$M[\$SP++]/g; # pop byte from stack
694    
695     s/\bIMM16\b/$imm \/\/= $M[$pc++] + $M[$pc++] * 256/xge; # 16 bit insn immediate
696     s/\bIMM8\b /$imm \/\/= $M[$pc++] /xge; # 8 bit insn immediate
697    
698     s/\bPC\b/$pc/ge; # PC at end of insn
699     s/\bBRA\b/return/g; # conditional jump
700     s/\bJMP\b(.*)/$1\x00/sg; # unconditional jump
701    
702     s/\bIN\b/ sprintf "\$A = in_%02x", $M[$pc++]/xge;
703     s/\bOUT\b/sprintf "out_%02x \$A ", $M[$pc++]/xge;
704     }
705    
706     $insn .= "$op;\n";
707     }
708    
709    
710     $insn .= "$pc";
711     $insn =~ s/\x00.*$//s;
712    
713     eval "use integer; sub { $insn }" or die "$insn: $@"
714     })->();
715    
716     ++$CLK;
717    
718     # things we do from time too time only
719     unless ($CLK & 0xf) {
720     # do I/O
721    
722     unless ($CLK & 0x7ff) {
723    
724     # pty/serial I/O
725     unless (@PUSARTRECV || @KQUEUE || !$PTY) {
726     my $rin = ""; (vec $rin, fileno $PTY, 1) = 1;
727    
728     if (select $rin, undef, undef, 0) {
729     sysread $PTY, my $buf, 256;
730     push @PUSARTRECV, unpack "C*", $buf;
731     }
732     }
733    
734     # keyboard input
735     if ($KBD) {
736     while (select my $rin = "\x01", undef, undef, 0) {
737     sysread STDIN, $STDIN_BUF, 1, length $STDIN_BUF
738     or last;
739     }
740    
741     stdin_parse if length $STDIN_BUF;
742     }
743     }
744    
745     # kick off various interrupts
746    
747 root 1.3 $RST |= 2 if @PUSARTRECV && $XON; # VT100, but works on vt102, too (probably not used on real hardware though)
748     #$INTPEND |= 2 if @PUSARTRECV && $XON; # VT102, 6.5 rxrdy
749 root 1.1
750 root 1.3 # kick off vertical retrace form time to time
751 root 1.5 unless ($CLK & 0x1ff) {
752 root 1.1 $RST |= 4; # vertical retrace
753     }
754    
755     # handle video hardware
756    
757     unless ($CLK & 0x1fff) {
758     prscr;
759     }
760     }
761 root 1.4
762     # the interrupt logic
763     $x = $INTPEND & ~$INTMASK;
764     if (($RST || $x) && $IFF) {
765     # rst 1 kbd data available
766     # rst 2 pusart xmit+recv flag
767     # rst 4 vertical retrace
768     # 5.5 vt125 mb7 trans ready (serial send?)
769     # 6.5 vt125 mb7 read ready (something modem?)
770     # 7.5 vt125 mb7 vblank h(?)
771     # trap vt125 mbi init h(?)
772     my $vec;
773    
774     if ($x & 1) { $vec = 0x2c; $INTPEND &= ~1;
775     } elsif ($x & 2) { $vec = 0x34; $INTPEND &= ~2;
776     } elsif ($x & 4) { $vec = 0x3c; $INTPEND &= ~4;
777     # } elsif ($RST ) { $vec = $RST * 8; $RST = 0; # for some reason, this breaks vt102
778     } elsif ($RST & 1) { $vec = 0x08; $RST &= ~1; # separate is better for vt102
779     } elsif ($RST & 2) { $vec = 0x10; $RST &= ~2;
780     } elsif ($RST & 4) { $vec = 0x20; $RST &= ~4;
781     } else {
782     die;
783     }
784    
785     $M[--$SP] = $PC >> 8;
786     $M[--$SP] = $PC & 0xff;
787     $PC = $vec;
788    
789     $IFF = 0;
790     }
791 root 1.1 }
792    
793     __DATA__
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801     2>2y 
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803     f#}rQ
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808     !
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810     !:~ O#
811     ##
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813     B
814     C
815     D
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824     ~!
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837     ;!{!32!y2!z~2!̮ͣ:!ʞw:!O#:!<qʬby@>c+!" !!͋!q" !{!'6# ͋>02x Waitpn P :U!Ϳ:V!! %:S!"! W:!
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